from django.db import models
from django.utils import timezone
import datetime
# 创建数据库的表,一个类一个表，一个变量一个字段
class Question(models.Model):
    question_text=models.CharField(max_length=200)
    pub_date=models.DateTimeField('data published')
    def was_published_recently(self):
        return self.pub_date>=timezone.now()-datetime.timedelta(days=1)
    def __str__(self):
        return self.question_text
# Create your models here.

class Choice(models.Model):
    question=models.ForeignKey(Question,on_delete=models.CASCADE)
    choice_text=models.CharField(max_length=200)
    votes=models.IntegerField(default=0)
    def __str__(self):
        return self.choice_text
